18 February 1930, Clyde Tombaugh 24 years old and fresh off a farm in Kansas patiently scans photographic plate at the Lowell  Observatory. He finds a tiny speck that turns out to be a new planet called Pluto. But in the 75 since then a close-up view of Pluto and its giant moon Charon still only come from the artist's imagination. Every other planet has been visited by NASA's spacecraft and the post office has issued stamps to commemorate their close encounters.

Tombaugh used the machine to look at photographs of the patch of the sky taken a few days apart. Night after night he patiently exposed the large glass plates. Day after day he had blinked the plates back and forth looking for anything different from the fixed points of starlight. Tombaugh still recalled just how uncomfortable and challenging the search for Planet X turned out to be. Tombaugh said, "you get cold getting up to I persevere, so this gets a brutally monotonous blinking back and forward."
Tombaugh was looking for that shifted position. Further, Tombaugh explained that " The only means we have identified that planet, there got to be smaller it's like a small star image. The only clue we have is a shift in position with an integral few days, nights, and time. It is the only clue we have got to see all this time. There are hundreds of, thousands of them to see. If there is any shift in position during the interval between the first and second plates. "That small movement was just Tombaugh saw on 17 February 1930. It was just Lowell and Tombaugh wanted to see a distant planet.

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By studying the motion of that dim and distant dot of light astronomers discovered a Pluto year.
The time it takes to move around the sun was equal to 248 earth years. The angle of its orbit was steeper than any other planet. Its distance from the sun also varied more than any other planet. For 48 years that was all, anyone knew about Pluto.

In 1978, astronomers Jim Christie and Bob Harington analyzed new plates taken at US Naval Observatory in Flagstaff. Christie noted an elongation of the planet to the north. One month later, the bump had disappeared. Blink the images back and forward just like Clyde Tombaugh did and we see the bump is moving there. The conclusion is that the Pluto, like Earth, has a moon.
By analyzing their orbits and their distance from each other astronomers were able to calculate their mass and size. Pluto was smaller than our moon about 1,500 miles diameter and had only one-tenth of its mass. Pluto and Charn together would barely stretch across the continental United States. From its size and orbit, astronomers estimated that Pluto is perhaps half rock and half ice that makes it one of the largest of a whole new class of objects. The ice dwarfs living out in what's known as Kuiper Belt. This region is named for Gerard Kuiper, a leading mid-20th-century planetary astronomer. Kuiper suggested that the solar system did not end with Neptune and Pluto. But that there should be a disc or belt of other worlds somewhere way out there.

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